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China-Japan Workshop on Solid Oxide Fuel Cells

Interconnection and Sealing Using Silver Metal for Honeycomb SOFCs

[+] Author and Article Information
Zhenwei Wang, Satoshi Shimizu, Yohtaro Yamazaki

Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan

J. Fuel Cell Sci. Technol 5(3), 031211 (May 27, 2008) (4 pages) doi:10.1115/1.2930771 History: Received September 18, 2007; Revised October 16, 2007; Published May 27, 2008

An interconnection and sealing method used for stacking the electrolyte-supported honeycomb solid oxide fuel cells (SOFCs) is presented. The honeycombs were made of 3mol% yttria partially stabilized zirconia and 8mol% yttria stabilized zirconia with 3×3 channels. The size of each channel was 5×5mm2 and 20mm long. The thickness of the channel walls is 1mm. The electrode materials were Ni-cermet and lanthanum strontium manganite. Newly designed metal plates with insulation layers were used for the interconnection and gas sealing between the honeycomb single cells. An open circuit voltage (OCV) of 2.19V was obtained at 800°C using a two-cell stack. A small amount of OCV reduction was observed during a thermal cycling. However, the high values of the OCVs and the stable current indicated preferable electric connections, and lower gas leakage. The successful test shows that the interconnection and sealing method with the proposed interconnect plates is promising for honeycomb SOFC stacks.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 2

Photograph of an interconnect plate coated with an Al2O3∕SiO2 insulation layer

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Figure 3

Photographs of (a) single cells and (b) a two-cell stack with interconnect plates

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Figure 4

Connection between the electrode and the interconnect plate

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Figure 5

Schematic diagram of the honeycomb SOFC test apparatus

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Figure 6

Power generation characteristics of 8YSZ single cell for various temperatures

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Figure 7

(a) Honeycomb SOFC test apparatus and (b) a mounted two-cell honeycomb stack

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Figure 8

Power generation characteristics of a 3YSZ two-cell stack for various temperatures

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Figure 9

OCVs of (a) a 3YSZ two-cell stack, (b) upper cell, and (c) lower cell. Fuel: H2(30ml∕min)+N2(30ml∕min). Oxidant: O2(30ml∕min).

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Figure 10

3YSZ two-cell stack test under the constant potential condition of 1.0V in the third run

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Figure 1

(a) Schematic diagram and (b) photograph of a 3×3 honeycomb single cell with oxidant-preheating channels

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